6V6P:
reference: Antagonism between substitutions in beta-lactamase explains a path not taken in the evolution of bacterial drug resistance., Brown CA, Hu L, Sun Z, Patel MP, Singh S, Porter JR, Sankaran B, Prasad BVV, Bowman GR, Palzkill T, J Biol Chem. 2020 Apr 16. pii: RA119.012489. doi: 10.1074/jbc.RA119.012489. PMID: 32299911

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